Laser Machining Scanner Head Distance Correction
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Solution Overview
Problem
Conventional laser machining devices often result in discrepancies between desired and actual machining distances due to deceleration issues at the end of scanning paths or corner portions, leading to inaccuracies in machining.
Innovation Solution
A laser machining device with a scanner head and movement control system that calculates and corrects the feedrate based on the angle of the laser beam and focal length to ensure equal desired and actual machining distances, using a distance calculation portion to determine and correct for any discrepancies in machining distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the scanner head moves at a constant feedrate based on predetermined machining parameters, then the machining process is simple and fast, but the actual machining distance differs from the desired machining distance due to deceleration at the end of scanning paths
Solution Approach 1:
The system pre-calculates the relationship between scan angle and machining distance before actual machining begins. This preliminary calculation creates a correction map that compensates for the geometric discrepancy between scanner movement and actual machining path, eliminating the need for real-time complex calculations during machining.
Solution Approach 2:
The system implements a feedback mechanism where the calculated distance difference based on scan angle is used to adjust the feedrate command. The control device continuously monitors the scan angle, retrieves the corresponding correction value, and adjusts the feedrate to ensure the actual machining distance matches the desired distance.
2Manufacturing precision
If the feedrate is adjusted to compensate for deceleration effects, then machining distance accuracy improves, but the control complexity and calculation requirements increase
Solution Approach 1:
The correction values for different scan angles are pre-calculated and stored in a lookup table before machining begins. This eliminates the need for complex real-time calculations during the machining process, as the control device only needs to retrieve the appropriate correction value based on the current scan angle.
Solution Approach 2:
The system transforms the complex feedrate adjustment problem into a simpler parameter lookup operation. By changing the control approach from calculating feedrate adjustments in real-time to retrieving pre-computed correction values based on scan angle parameters, the system reduces computational burden while maintaining accuracy.
3Measurement precision
If the scanner head decelerates at the end of weaving paths, then the laser beam can be precisely positioned, but the actual machining distance becomes shorter than the desired machining distance
Solution Approach 1:
The system uses the scan angle as feedback to determine the appropriate feedrate correction. By continuously monitoring the scan angle and retrieving the corresponding correction value from the pre-calculated data, the system compensates for the distance shortfall caused by deceleration, ensuring the actual machining distance matches the desired distance.
Solution Approach 2:
The system adjusts the feedrate parameter dynamically based on the scan angle parameter. By changing the feedrate according to the pre-determined relationship with scan angle, the system compensates for deceleration effects without requiring complex real-time control adjustments.
Data Source
AI summary
A laser machining device includes a scanner head which can scan a laser beam, a movement means for the scanner head, a scanner head control device and a movement control device. In the laser machining device, the scanner head control device controls, based on a machining parameter on a path motion, the scanner head such that the laser beam is scanned in a first direction and a second direction, the scanner head control device includes a distance calculation portion which calculates, from the information of an angle θ formed by a normal to an item to be machined from the scanner head and the direction of application of the laser beam and a focal length, a difference between a desired machining distance and an actual machining distance and based on the result of the calculation, the movement control device corrects the feedrate of the movement means or the scanner head control device corrects the machining parameter such that the desired machining distance and the actual machining distance are made equal to each other.